2400
If three or more unequal threads are twisted together the counts of the resulting thread may be found by adding the fractions of a pound which a hank of each count represents.
Example.—Find the counts of a threefold thread composed of one thread each of 10’s, 20’s and 60’s cotton.
110 + 120 + 160 = 6 + 3 +160 = 1060 = 16 or 6’s counts.
Some allowance must be made for the twisting of the threads, but this will vary with the number of turns per inch in the yarn, and so is not taken into account in the example.
If it is required to obtain the weight of each count in 100 lbs. of the threefold yarn, the following is the method.
As one count is to the resulting count, so is the total weight to the weight required of that yarn—
10 : 6
60